Zyth, Nightmare Feeder

Flying, deathtouch
Zyth gets +1/+0 for each Nightmare you control.
Whenever Zyth deals combat damage to a player,
you and that player mill that many cards. Then
you choose a creature put into a graveyard this
way and exile it. Create a token that's a copy of
the exiled creature, it's a Nightmare in addition
to its other types.
"Don't fall asleep... He's already near."